On Thanksgiving, they had a special lunch prepared for everyone that had to come into the office (mostly just to monitor and be ready if anything went down). There were emails and signs, everyone was excited about it. When I went down with my team, they stopped me and a couple of other contractors at the door and said we couldn't go in unless we were full-time employees. There was no mention of that anywhere. We had to go get lunch somewhere else.
A couple of times a year they would buy movie tickets for everyone at a nearby theater. At lunch, the full-time staff would leave to go watch a movie for a few hours while the contractors stayed in the office.
Both of these weren't really a big deal, but they definitely made you feel like you were a second class employee.