Continuity mistake: From the moment Helen walks into Julie's bedroom, while Tod hides under the bed, to when he gets the camera, things in room repeatedly change between shots; for example, the blue and white blankets. (00:11:10)
Continuity mistake: When Kevin sings the delightful diarrhea song in the van, Taylor holds the burger in her left hand, as she chews on the hoodie string held in her right hand. Next shot, she eats the burger held in her right hand. (00:05:50)
Continuity mistake: On the drive home from the baseball game, as Kevin sings the diarrhea song, Karen wears the seatbelt, then does not as it pans from the back to front seat, and does again in the next close-up. (00:05:45)
Continuity mistake: When Helen searches Garry's closet, things on the shelf change between the lower and overhead shots. (01:06:10)
Continuity mistake: When Kevin finds out that Cowboy Dan is not coming, in the shot from the front his hat's chin string is behind his shoulders, but in shots from behind, the string is under Kevin's chin. (00:58:50)
Continuity mistake: When Tod has spoken to Gary and tells Helen he is "one messed up little dude", she sighs and her shoulders slump but the very next shot has her hands on the counter edges and she's staring straight ahead.
Continuity mistake: When Taylor is in the play she shakes her hat down, but in the next shot her hat is back on her head.
Answer: The movie is being told in a linear timeline. You have just about all the information right! I think the one thing you are letting throw you off is your assessment of the Super Bowl. You are surmising that they had just watched the game that day, but my assessment is that they are talking about the game from months ago (bearing in mind that Larry has not been around for years and has not seen his father since the last Super Bowl). My belief is the movie takes place in May. That would add up with Kevin's next year of school being 4 months away as schools usually start in September, and the math also works out with Karen's February due date. This would also explain your concern about the weather. As for Helen's baby, it is not made clear whether or not she married Mr. Bowman, nor does it really matter for timeline purposes, but they consummated the relationship not long after the first date and she got pregnant.
jshy7979