This is the start of a short arc concerning Magenta’s birthday party.

And here are houses. Houses that look like their owners. Green is getting bills. by Chapter 3 he’s been away from his house for several months. They have probably already cut off his utilities.

Some more random things: Red has a garage, and therefore owns a car. The bushes around Blue’s house are brown, again before any brown-leaved trees were shown. There is an indication of blades of grass at the bottom of the post the mail box is on. That means that the big white void they’re always standing in is sometimes just a grassy field, where the grass looks like a big white void. This is also another “Red in weird places” comic.