If any of these pops up, consider bowing out. If you're getting signals that people on these teams are playing politics, that's going to carry over into the new organization. Mismatched expectations usually cause infighting. Acquirers sometimes try to portray deals as mergers of equals, when all they really intend to do is come in and take over. In those cases, transition teams are a farce.
Mergers are never business as usual.
The best acquirers are realistic. Expect the senior team to level with you. But if there's no communication, that's a very bad sign. Success hinges on people getting the work done. And people don't perform well when they're kept in the dark.