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The house that they use for Alison in Gary Unmarried is the same house they used for Peggy in Everybody Loves Raymond. Even the house number matches.
It is mentioned several times in this episode that Mitch, Jack, and the kids have tickets to see Danny Gans. Gans died on May 1, 2009, just days before this episode's original airdate (May 6).
In the scene where the teams tries to "visualize" bowling, the number of glasses on the table keeps changing between one and four. Jack sometimes hold his glass in his lap and sometimes on the table, which is normal, but Stuart's glass goes between the table and his hand, and Gary's goes from the table to the bar behind him without either person ever getting near the table. Further, Dennis empties his glass early in the scene, and the glass is later suddenly half filled. Finally, near the end of the scene Dennis orders three shots from the bartender, which then immediately appear on the table.
Taylor says that he told Gary to buy Google in 1998. Google was not publicly traded until 2004, and was only founded in September of 1998.
The paint on Taylor's shirt changes places between scenes. When Gary first rolls green paint on Taylor's shirt, it covers the right part of the shirt's logo. Later on, the paint covers up the left side of the logo.
Goof: When Gary and Allison are in the tiny house Allison pours herself a drink and Gary's tiny cup remains empty. They later make a toast and Gary drinks from an empty cup.
It is revealed that both Walter and Louise play the cello.
It is revealed that Gary's house painting business is known as Gary's House Painting.