Continuity mistake: During the bath scene where Jane is in the tub and Jake is sitting there talking, the candle on the window sill changes location. In the close up shots the candle and mug on the window sill are right next to one another. In the wide shots, the candle is towards the middle of the window.
Continuity mistake: In the scene where Jake and Jane are in the bar sharing a drink, Jake's hands are seated on the bar top as he speaks. As the film cuts to a closer shot of the two, his right hand is not only raised off the bar, but is holding his drink which had previously been sitting close to his left hand.
Continuity mistake: About one hour in when Meryl Streep is serving Croque Monsieur to Steve Martin and discussing cooking in Paris, Meryl takes the 2 snacks off the baking sheet and places on the plates with salad. They then talk a little more and the camera shot changes, she then removes 2 Croques from the baking sheet again and serves up once more.
Continuity mistake: In the scene where the family sits to eat, as Jake is leaving, Harley takes the green beans and places it next to his future mother in law. After the camera goes to Jake standing by the door. When the camera comes back to the family, the beans are once again in Harley's hands.