During the trumpet and sax solos, Marcus often slightly mutes a note with a spare left hand finger whilst playing, producing a muted sound, but the pitch of the note remains audible. I have indicated this by making them ghost notes, in brackets.
In the extremely impossibly fast section of the bass solo, I suggest that you don’t try and produce a forceful slap sound, as it will be much harder to play up to speed, you could play it fingerstyle if you want, it doesn’t really matter. The hardest part about this section is the very awkward positions you have to stretch into. You may find it easier to rearrange the fingering, and in some cases you could probably tap the top note with your right hand. There are also a couple of notes there which are possible to play as open strings.