Boimler makes the claim that, "Fortune favors the bold." Captain Benjamin Sisko said the same thing when realizing the enemy fleet outnumbered them 3:1 before the battle to retake Deep Space Nine from the Dominion in Favor the Bold (1997).
One of the Cerritos' engineers has a VISOR similar to the one Geordi La Forge had through out Star Trek: The Next Generation (1987).
Delta shift characters are drawn the same as beta shift with different hair and skin colors.
As the trio of Beta Shifters (Mariner, Tendi, & Boimler) step down into the swamp under the hydroponics bay, the skeleton of a wayward Doopler can be briefly seen in behind a bunch of roots.