When Michael (Jason Bateman) is speaking to his former girlfriend, Maggie Lizer (Julia Louis-Dreyfus), he says "It's probably some geek Simpsons writer's kid." This is a reference to the show's consulting producer Jennifer Crittenden who was a long-time staff writer for The Simpsons (1989).
When George Sr. (Jeffrey Tambor) is at the Ford dealership, the salesman tells him that the Bronco has been discontinued to try to shed the whole "fugitive on the run" image. This is a reference to O.J. Simpson, who fled from the police in a white Bronco. While the salesman is making the fugitive on the run comment, George is sitting in a Ford Escape and an inflatable tube man can be seen in the background with a withered left arm. Simpson is referenced again in the hospital when Lucille (Jessica Walter) yells "Get my son the juice!" "The Juice" was the former running back's most well-known nickname.
When Michael (Jason Bateman) tells George Michael (Michael Cera) that he met up with Maggie (Julia Louis-Dreyfus) again, George Michael says, "Her?" This goes back to what Michael would often say about George Michael's girlfriend, Ann (Mae Whitman).
As with Maeby (Alia Shawkat) and Surely and Sitwell (Ed Begley Jr.) and Standpoor, Maeby's film is called "The Young Man and the Beach", which is the opposite of The Old Man and the Sea (1958).
The two gay cops were previously seen in episode 1.21, Not Without My Daughter (2004), where they both brought their daughters (not seen on screen) to work. It is possible that they had daughters in other relationships, but it doesn't seem that they were written as gay cops back then.