On the bus when Wesley switches cassette tapes and puts a rap one in, he actually puts in a copy of Mr. Big's "Lean Into It." It's a rock album, and even if Wes recorded over it with rap music, it still doesn't take into effect that Lean Into It came out in 1991, almost 7 years after this movie took place.
When Tobe is scratching the side of the bus with the nails, the sound it makes indicates that it should be making visible scratch marks, yet none are visible.