Continuity mistake: When Oscar and Felix are saying goodbye you can see that a girl pass by them three times at least and she does the same movement.
Continuity mistake: In the final scene when Oscar introduces Felix to his card playing buddies, watch carefully at the guy in the toupee. Between shots he has his sandwich in one hand and then hes reaching for it and then its just sitting there. This happens about three times.
Continuity mistake: When Oscar and Felix are driving along the highway when the camera changes back and forth from Felix and Oscar Felix's tie goes from being under the seat belt to over the seat belt, this happens a few times.