Factual error: In the scene where we first meet Rosie, it opens with a shot of the house and then goes inside, passing by some pictures of Rosie and her husband. One of them, a picture of their wedding, says "Frank and Rosie - Wedding 1948", but then when Rosie is talking about how her husband will know how much she still loves him after all those years, Robbie says that he hopes that he and Linda will be as happy as Rosie and her husband on their 50th anniversary. If they got married in 1948, they would be closer to their 40th wedding anniversary. Since the movie is supposed to take place in 1985, this would actually be their 37th wedding anniversary.
Factual error: In the scene when Robbie is going to baby sit his sister's kid, her husband mentions the episode of "Dallas" when they shoot J.R. That episode was aired March 21, 1980, but the film was supposed to be in 1985. It can't be a rerun, because he's surprised that JR just got shot - if it had happened 4 years earlier it wouldn't be a big story.