See No Evil, Hear No Evil (1989)

Continuity mistake: Towards the end of the movie Dave takes Walley's jacket and uses it to help them slide down a cable. Before they slid down, Dave tells Walley to hold on, and Walley asks if they're going to be above the ground. Dave tells him no, and off they go. However, Dave is deaf, and reads lips, and Walley is standing behind him when he asks the question. So how did Dave read his lips if he wasn't looking at him?

Continuity mistake: Wally and Dave exit the swamp after pushing the police car in. Look at Wally's legs; you can see a pair of Wellington boots underneath his trousers.

Other mistake: In the alley scene immediately following the jail escape Dave and Wally are trying to open a door, Dave steps away from Wally and while looking away says "There's an alley!" Wally hollers out "Dave!" and Dave whips back around and says "I'm right here, I'm right here!" He wouldn't have been able to have heard his name being shouted since he is deaf. (00:39:00)

Il Duce

[Woman checks the back pockets of Wally's pants for the coin.]
Wally: I don't know what you're looking for, but it's a little to the right.

Wally: [yelling in Dave's ear.] Shazaam! Can you hear me?
Dave: Wally! I heard you! I heard your voice!
Wally: Hooray! You can hear me!
Dave: What?
Wally: You can hear me!
Dave: No, schmuck, I'm deaf! I'm deaf! Now do you get it?

Wally: I hear prison isn't so bad if you like it up the butt.