Donnie Brasco (1997)

Continuity mistake: When Pacino asks a guy in a barbershop about Depp, the guy is being shaved, and the shaving foam is only on his cheek, but when he's at the doorway calling to Depp to come in the barbershop the foam reaches his temple, then back inside the foam is only at his cheek again.

Sonny Black: You know what we do when we find that rat, right, Lefty?
Lefty: 'Could be I found him already.

Trivia: Throughout the entire movie, Donnie Brasco is seen wearing a wire device. In the actual book, Agent Pistone was said to only wear a wire maybe a few times in the 6 years he was undercover.

Question: Did the real Lefty actually have "cancer of the prick", as was claimed in the movie?