Everyone partying it up before the end of the world. Patton Oswalt's character reveling in the loose sex he's been having since the reports is the cherry on top.
The whole Friendsy's scene. Everyone looks like a bunch of ravers (and are even rolling on ecstasy or getting stoned) and just accepting anyone that's coming in.
The random guy in the police station, wearing a sandwich board proclaiming the end is nigh. Dodge calls him "a peaceful, validated man."
Dodge returning home after being on the road for about a week and finding his housekeeper Elsa still there, cleaning as if it's not the last day before the end of the world. Dodge's reaction: "Are you shitting me?!" Doubles as sort of a Heartwarming moment, since Elsa considers Dodge her friend and continues to work, whether or not she is aware of what's been going on.
Can double as a tearjerker as no one in a civilized society wouldn't know what was happening. People cope with situations different ways and for Elsa that is treating everyday like there will be a tomorrow. The alternative for her may just be too much for her to stand.