These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: 2point4 Children
Crosses the Line Twice - One episode did this with a joke where Ben puts David's goldfish into a food mixer (since they don't have a tank for it yet) and then accidentally switches on the mixer. At the end of the episode, the show broke the fourth wall with actor Gary Olsen explaining how they used a prop fish - and then went into this trope, with another scene where Olsen accidentally microwaves the real fish.
Some Anvils Need to Be Dropped - One of the Christmas specials ended with Bill giving a speech about how easy it is to become homeless. This was about as far as possible from subtlety, but nevertheless an important message, especially given the time of year.