Visible crew/equipment: In one shot when Meg Ryan and Bill Pullman's characters are speaking in front of a shop window, you can see the cameraman's reflection. You even see him pivot his torso to follow the actors as they walk offscreen.

Factual error: While Meg Ryan is typing her letter to "Sleepless and Son," Rosie is sitting on the couch watching "An Affair to Remember." Any true fan of AAtR can easily notice that the editing of AAtR has obviously been tainted by the director of Sleepless - the scene with Deborah Kerr and Cary Grant leaning on the railing of the boat takes place towards the beginning of the movie, with the scene of them looking up at the Statue of Liberty taking about 4 days later. However, in Sleepless, the scenes shown of the continuously moving AAtR "movie" on Meg's TV are incorrect - the scene with Kerr and Grant leaning on the railing starts the sequence, it then jumps WAY ahead to them staring up at the Statue of Liberty (which then would have been about 4 days later), and ends with them standing at the railing of the boat again (4 days before).

Continuity: In the dinner scene where Tom Hanks is discussing the topic of movies with Rita Wilson, notice the drink glasses. They amount of wine in the glasses change several times throughout the scene.