When Rick and Summer are eating with Morty's original family, Jerry pulls out Rick's portal gun and declares it "stinks of Rick". This is the family featured in the first 6 episodes of the series, until and including Rick Potion #9 (2014), Jerry is well aware this is Rick's portal gun, he wouldn't have to sense or guess Rick's involvement.
when the president of federation shoots himself in the head, the sound effect is sooner than it should be.
When Rick is fabricating his origin story, he kills Beth and his wife in the garage. The Federation should have already known this is a falsehood and the bug agent should have already been well versed in the Rick profile for C-137.