Sandra strongly implies that she lost her virginity to Jerry. In Magazine Profile (2015), it was revealed that she'd been having sex with Sal in the store, more than a year before she met Jerry.
When the staff attempts to leave the morning after the blizzard, the automatic doors attempt (unsuccessfully, due to the massive amounts of snow) to open. No one had been near the doors yet, and they would have been locked and powered off overnight.
Glenn is dismayed that Jonah and Amy are sharing an air mattress for the night due to them being unmarried. He offered them his tickets to the Cloud 9 manager's conference, with an included overnight stay in a shared hotel room, in Managers' Conference (2018).