In the pilot, there is a Take That! at Donald Trump. This may seem as a lame attempt to be relevant, but keep in mind the show takes place in the very liberal San Francisco and Trump was running for President (and later won) as a Republican.
Steph's line to Tommy about "This Dairy Queen is closed" takes on an extra meaning when we find out later in the series that she's barren.
The Gibblers left San Francisco to travel the world 20 years ago. Kimmy and Jimmy have not seen them since. Jimmy is only 28. They left an 8-year-old alone.
In Oh My Santa Kimmy discovers Christmas presents Tommy Sr had hidden away for DJ and the boys that they never got. This implies he died during the Christmas season.
