If you look at Jacky’s blanket in the last panel, you can see the impression of Quagmire’s face in the wrinkles. This was me subtely indicating that even though the demon was defeated, his influence wasn’t totally gone.
“Gawd I hate you!!” was totally lifted from another webcomic I was reading at the time. I’m pretty sure it was WTH? by Joshua Jericho, which doesn’t seem to be online anywhere, anymore.