The episode opens with a transmission from Chromia who last seen, albeit barely, as part of the Ark's crew in "Eruption." Whether it's now being retconned that she remained on Cybertron or she returned home in the time skip between seasons is as of yet unclear.
Optimus tries to restart the alternate Ark using the override key on the right arm of the command chair that Teletraan-X used to reboot the ship in the last episode.
When the Ark enters unspace, Wheeljack swears by Prima.
Real-world references
Trivia
Noticeably, Wheeljack pronounces "Quintesson" with an accent on the second syllable, whereas in most media the third syllable is the one given emphasis.