Bear in mind that not all mistakes found apply as there might be references to functions, third party stuff, etc. I’m just leaving the entire output up in case you want to run codespell yourself on the repository.
More about codespell: https://github.com/codespell-project/codespell
./BREAKING-CHANGES.txt:128: occured ==> occurred
./BREAKING-CHANGES.txt:524: verison ==> version
./modules/juce_audio_processors/format_types/VST3_SDK/pluginterfaces/base/smartpointer.h:186: DONT ==> DON'T
./modules/juce_audio_processors/format_types/VST3_SDK/pluginterfaces/base/iupdatehandler.h:61: usefull ==> useful
./modules/juce_audio_processors/format_types/VST3_SDK/base/source/fobject.h:113: usefull ==> useful
./modules/juce_audio_processors/format_types/VST3_SDK/base/source/fstring.h:225: occurences ==> occurrences
./modules/juce_audio_processors/processors/juce_AudioProcessor.h:415: reciever ==> receiver
./modules/juce_audio_processors/processors/juce_AudioProcessor.h:415: succesfully ==> successfully
./modules/juce_audio_processors/processors/juce_AudioProcessor.h:416: reciever ==> receiver
./modules/juce_audio_processors/processors/juce_AudioProcessor.h:1562: succesful ==> successful
./modules/juce_audio_processors/processors/juce_AudioPluginInstance.cpp:44: compatibilty ==> compatibility
./modules/juce_audio_processors/processors/juce_AudioProcessorParameter.h:219: funtion ==> function
./modules/juce_gui_extra/native/juce_AndroidViewComponent.cpp:125: occassionally ==> occasionally
./modules/juce_gui_extra/misc/juce_PushNotifications.h:145: extention ==> extension
./modules/juce_gui_extra/misc/juce_PushNotifications.h:399: indentifier ==> identifier
./modules/juce_blocks_basics/juce_LittleFootFunctions.dox:113: minumum ==> minimum
./modules/juce_blocks_basics/protocol/Protocol Format.txt:30: ths ==> the, this
./modules/juce_audio_formats/codecs/juce_CoreAudioFormat.cpp:668: consistantly ==> consistently
./modules/juce_audio_formats/codecs/flac/metadata.h:95: accomodated ==> accommodated
./modules/juce_audio_formats/codecs/flac/compat.h:32: prefered ==> preferred
./modules/juce_audio_formats/codecs/flac/libFLAC/stream_decoder.c:172: seeked ==> sought
./modules/juce_audio_formats/codecs/flac/libFLAC/stream_encoder.c:1896: publically ==> publicly
./modules/juce_audio_formats/codecs/flac/libFLAC/bitreader.c:146: layed ==> laid
./modules/juce_audio_formats/codecs/oggvorbis/ogg.h:85: seperate ==> separate
./modules/juce_audio_formats/codecs/oggvorbis/ogg.h:105: seperate ==> separate
./modules/juce_audio_formats/codecs/oggvorbis/framing.c:632: Supress ==> Suppress
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/mapping0.c:67: compatable ==> compatible
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/lsp.c:91: assymetric ==> asymmetric
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/lsp.c:178: assymetric ==> asymmetric
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/lsp.c:265: assymetric ==> asymmetric
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/block.c:188: tranform ==> transform
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/block.c:950: funtion ==> function
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/vorbisenc.c:1197: explictly ==> explicitly
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/vorbisenc.c:1199: dependant ==> dependent
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/bitrate.c:202: inbetween ==> between
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/vorbisfile.c:266: seeked ==> sought
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/vorbisfile.c:532: seperating ==> separating
./modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/vorbisfile.c:1815: inheritence ==> inheritance
./modules/juce_graphics/fonts/juce_GlyphArrangement.cpp:264: originalY ==> originally
./modules/juce_graphics/fonts/juce_GlyphArrangement.cpp:330: originalY ==> originally
./modules/juce_graphics/image_formats/pnglib/png.c:1019: assymetrical ==> asymmetrical
./modules/juce_graphics/image_formats/pnglib/png.c:1897: accomodate ==> accommodate
./modules/juce_graphics/image_formats/pnglib/png.c:1982: cannnot ==> cannot
./modules/juce_graphics/image_formats/pnglib/png.c:2500: formated ==> formatted
./modules/juce_graphics/image_formats/pnglib/pnginfo.h:243: corresponsing ==> corresponding
./modules/juce_graphics/image_formats/pnglib/pngread.c:1136: indicies ==> indices
./modules/juce_graphics/image_formats/pnglib/pngread.c:2096: indicies ==> indices
./modules/juce_graphics/image_formats/pnglib/pngread.c:2661: indicies ==> indices
./modules/juce_graphics/image_formats/pnglib/pngread.c:2701: indicies ==> indices
./modules/juce_graphics/image_formats/pnglib/pngrtran.c:1309: undesireable ==> undesirable
./modules/juce_graphics/image_formats/pnglib/png.h:1330: preceeded ==> preceded
./modules/juce_graphics/image_formats/pnglib/png.h:1849: occured ==> occurred
./modules/juce_graphics/image_formats/pnglib/png.h:1854: WTIH ==> WITH
./modules/juce_graphics/image_formats/pnglib/png.h:2389: WTIH ==> WITH
./modules/juce_graphics/image_formats/pnglib/png.h:2787: accomodate ==> accommodate
./modules/juce_graphics/image_formats/pnglib/pngrutil.c:101: accomodate ==> accommodate
./modules/juce_graphics/image_formats/pnglib/pngrutil.c:2792: occured ==> occurred
./modules/juce_graphics/image_formats/pnglib/pngwutil.c:871: relevent ==> relevant
./modules/juce_graphics/image_formats/jpglib/jmorecfg.h:187: thru ==> through
./modules/juce_graphics/native/juce_RenderingHelpers.h:2403: tolerence ==> tolerance
./modules/juce_graphics/native/juce_RenderingHelpers.h:2405: tolerence ==> tolerance
./modules/juce_graphics/native/juce_RenderingHelpers.h:2406: tolerence ==> tolerance
./modules/juce_graphics/native/juce_RenderingHelpers.h:2407: tolerence ==> tolerance
./modules/juce_graphics/native/juce_RenderingHelpers.h:2408: tolerence ==> tolerance
./modules/juce_graphics/geometry/juce_Line.h:181: dont ==> don't
./modules/juce_audio_plugin_client/AU/CoreAudioUtilityClasses/AUPlugInDispatch.cpp:440: inheritence ==> inheritance
./modules/juce_audio_plugin_client/AU/CoreAudioUtilityClasses/CAMutex.cpp:252: happenned ==> happened
./modules/juce_audio_plugin_client/AU/CoreAudioUtilityClasses/CAMutex.cpp:295: happenned ==> happened
./modules/juce_audio_plugin_client/AU/CoreAudioUtilityClasses/CAAtomic.h:83: occured ==> occurred
./modules/juce_audio_plugin_client/AU/CoreAudioUtilityClasses/AUBase.h:710: compatability ==> compatibility
./modules/juce_audio_plugin_client/AAX/juce_AAX_Wrapper.cpp:1895: dependant ==> dependent
./modules/juce_core/misc/juce_StdFunctionCompat.h:54: targetting ==> targeting
./modules/juce_core/files/juce_File.h:117: existance ==> existence
./modules/juce_core/containers/juce_HashMap.h:391: resemblence ==> resemblance
./modules/juce_core/network/juce_URL.h:350: controling ==> controlling
./modules/juce_core/network/juce_URL.h:467: responsibile ==> responsible
./modules/juce_core/network/juce_WebInputStream.h:104: succesful ==> successful
./modules/juce_core/network/juce_WebInputStream.h:115: succesful ==> successful
./modules/juce_core/network/juce_WebInputStream.h:156: succesful ==> successful
./modules/juce_core/text/juce_String.h:679: upTo ==> up to
./modules/juce_core/text/juce_String.h:680: upTo ==> up to
./modules/juce_core/zip/zlib/deflate.h:193: supress ==> suppress
./modules/juce_core/streams/juce_MemoryOutputStream.h:40: intial ==> initial
./modules/juce_cryptography/encryption/juce_BlowFish.h:76: accomadate ==> accommodate
./modules/juce_audio_basics/mpe/juce_MPENote.h:135: Inital ==> Initial
./modules/juce_gui_basics/native/juce_common_MimeTypes.cpp:480: applicaiton ==> application
./modules/juce_gui_basics/native/juce_android_ContentSharer.cpp:297: extention ==> extension
./modules/juce_dsp/containers/juce_SIMDRegister_test.cpp:134: dependant ==> dependent
./modules/juce_dsp/containers/juce_SIMDRegister.h:42: availabe ==> available
./modules/juce_dsp/containers/juce_AudioBlock.h:330: reciever ==> receiver
./modules/juce_dsp/containers/juce_AudioBlock.h:347: reciever ==> receiver
./modules/juce_product_unlocking/in_app_purchases/juce_InAppPurchases.h:221: successfull ==> successful
./extras/NetworkGraphicsDemo/README.txt:8: heterogenous ==> heterogeneous
./extras/Projucer/Source/Project/jucer_Project.cpp:913: targetting ==> targeting
./examples/Utilities/OSCDemo.h:417: occured ==> occurred
./examples/GUI/FontsDemo.h:111: intially ==> initially
./examples/GUI/ComponentDemo.h:95: dont ==> don't
