Someone accidentally loads up the wrong hologram in the Home One briefing in ROTJ, and promptly scrambles to switch it out before people start judging.
Speaking of this idea… this one may need to go to the best edit thread:
In TROS, after the Resistance listens to and responds to the message about Palpatine returning, it turns out that message is 30 years old and the informant wanted them to play the datatape backwards, and it is Kylo declaring full scale war against any anti-FirstOrder planets. Poe then lets out a "whew… i thought somehow Palpatine returned.