In the closing scene, a miscue by Grant and possible one by Hepburn, come off OK. Tracy opens a side door to announce to the guests that she and her fiancé "that was" have decided to call it a day. Dexter is standing behind her, and she says, "uh ... Dexter, what next?" He says "Three (sic) years ago I did you out of a wedding in this house by eloping to Maryland." She says to the guests, "Two years ago, uh, you were invited ..." She corrected the number of years which Grant clearly states wrongly - three, to two, but in catching and correcting his error, she got the rest of the line wrong.
In the closing scene, a photographer takes a picture of Dexter and Tracy at their wedding. The camera makes a loud click and they react by looking at the photographer. Moments later, a photograph is shown; however, it shows them looking directly at the camera. Since the picture was taken first, Dexter and Tracy should be looking away from the camera.
When Tracy and George talk at the party the night before the wedding, George informs her that "it's after four" in the morning. After that, several hours of activity take place, but it's still dark outside when they all eventually go to bed. Assuming that all this takes place in the Summer months, Mike's visit to Dexter's house, Liz's arrival at Dexter's and the typing up of the letter, Tracy and Mike's dancing and swim, and Georges arrival on the scene and argument with Tracy and Mike should all have taken place in the bright light of morning.
When Tracy and Dexter are talking about the information that Kidd has on her father, Dexter hands her pictures and the story of her father and the dancer, Teena Mara. After Tracy shuffles through the paper multiple times, there doesn't seem to be anything written, typed or have pictures on this paper.