Sburb was developed by a company called Skaianet in the pre-scratch universe. Considering that the technology for the game is found in the frog temples on Jade and Jake’s island, it’s highly possible that Grandpa Harley had a hand in it’s making. 

Dream bubbles are essentially an after life for dead sburb/sgrub players. Their environment is made up by the ghost’s memories but they can change. Feferi asked the Horrorterrors to make them on this page. 

Retcon Davesprite was killed because he happened to be on lowas with John. As for there being two Jaspersprites that remains to be seen. 

On this page we see that Arquiusprite, half of Gamzee, and Caliborn are sucked into Lil Cal. Doc Scratch was created ectobiologically from Lil Cal and a white cue ball. So when he died Lord English emerged from his body as a fusion of those three guys. 

Nobody raised Dirk, he was on his own from the start. 

Dad Egbert is John’s dad, the guy with the pipe and hat who baked a lot.

Fefetasprite is not mute she just never speaks directly in the narration. Roxy mentions that she spoke with her all the time here.

Since they’re paradox clones then no they probably don’t have bellybuttons. 

Sollux felt both flushed and pitch for Gamzee because of his duality theme (although his initial feelings may have been caliginous since Gamzee just killed two of his friends). Terezi felt caliginous for the same reasons. Karkat felt pale because he wanted to pacify Gamzee to calm him down. Gamzee did accept Karkat’s pale solicitation. Gamzee manipulated Terezi into killing Vriska possibly so that he didn’t have to deal with her himself. 

The scratch is a release of temporal energy that causes Skaia to switch which portals the meteors go through. It results in a reset universe and a switched set of players. The scratch was always necessary for the alpha timeline so it didn’t affect any other timelines.