Continuity: Meg Ryan and the bloke she was going to marry first were picking out colours for the house and he points to one but when he mentions later on he points to a different one.

Factual error: The comet is seen to move rapidly across the sky. This in actuality never happens as they are so far away. The speed shown in the film is more appropriate for a shooting star.

Continuity: When Tim Robbins and Meg Ryan are on the balcony looking at the stars, the camera is doing a shot from the front - Tim is on the right and Meg is on the left. The camera then does a shot from behind them and Tim is still on the right and Meg is still on the left.

Continuity: When Meg finally Realizes her feelings for Tim she puts her legs on his lap. The angle changes and she does it again.

Continuity: Towards the end, when Tim Robbins is chasing the President's car, he stops by Einstein's house first (he is wearing a red jacket). When they show a close up of his hand knocking on the door, his sleeve is blue. When they cut back out, it's red.

Factual error: At the reception after Ed Walters delivers his fake scientific lecture, Miss Boyd is congratulating him and pesters him for more. She asks: "Do you know, I believe that you used DeBroglie's formula for the length of the pilot wave. I forgot that bit. Could you remind me?" So then Ed clumsily responds by way of secret signals from Einstein & company. What they relay to him is x = w^3/pi, but this has no relation to DeBroglie's formula.