Continuity mistake: When Rudy thanks his employer for the key and the blanket, each shot that faces Rudy you can see a large amount of snowflakes falling. However, whenever the shot faces his employer there is only an occasional snowflake that falls. (00:53:40)
Continuity mistake: When Notre Dame are huddling up on the field right before their final game, Coach Devine is giving his pep talk with his back facing Rudy. The very next shot, he's done a complete 180 and is now facing Rudy.
Continuity mistake: When the team captain comes in to talk to the coach about giving up his spot for Rudy so Rudy could dress, the coach has a clock/pen and pencil set at the front of his desk. However, when the captain and all the other players lay their jerseys on the desk, the pen and pencil set is gone. (01:33:30)
Continuity mistake: When Rudy opens one of his rejection letters, he checks his mailbox and heads to a cafe. This cafe is in a building on the actual Notre Dame campus, has no student mailboxes in it, and is not the Holy Cross College campus where his mailbox should be. (00:59:15)
Continuity mistake: In the bar scene when Frank turns around and pushes Pete, you can see Rudy's dad get out of his bar chair in the background. Two shots later he is seated and then gets out of his chair again.