Continuity: When Lawrence leaves the hotel room in New York, to meet with his publisher, he's walking down the hotel corridor carrying his tie and a champagne bottle in his hand, however he doesn't remove his tie or buy the champagne until after his meeting.
Continuity: When Lawrence and Janet are in bed he asks her a question and she moves her arm above her head. The shot switches and while she's answering her arm is down at her side. After she answers she again lifts it up.
Factual errors: The license plate on the back of Lawrence's car is in fact not an accurate Pennsylvania license plate. The lettering used is not the correct style, nor the correct color.
Factual errors: Janet states that it was Prof. Wetherhold that caused her to switch her major from English to biology. In order to get into professional school she would had to have taken Pre-med which is a more rigorous course of study.
Continuity: When the congratulatory card slips out of Lawrence's manuscript, it is at about a 45 degree angle from the edge of the desk (roughly from Lawrence's point of view). In the next shot, it is perpendicular to the edge of the desk. This may be more obvious when using the stack of paper next to the card as a reference.
Errors in geography: In the exterior New York hotel shots, the taxi is clearly not a NYC taxi as suggested by its color and license plate. The checkers, logo and phone number are all visible on the side of the cab. The cab is also missing the NYC medallion, the medallion number on the roof, and the sub-letter on its license plate (all evident from the tunnel shots).