The title is Spanish for “Two Little Hills”, and aside from a literal description of the episode’s plot, reminded me of the song “Dos Oruguitas” (Two Butterflies) from the movie Encanto. A similar title was LD: "wej Duj", Klingon for "Three Ships".

The collector’s (Yorif by the closed captioning) ship is a Zibalian freighter (TNG: “The Most Toys”), and the collector himself is of the same unnamed species as Palor Toff from that episode, which also appeared in LD: “Reflections”. He has Hupyrian guards (TNG: “The Nagus”, et al.). Tendi’s holographic disguise is that of a Heliian woman, the species to which Aquiel belonged (TNG: “Aquiel”). 

Seen in the collection is a Risian horgh’an (TNG: “Captain’s Holiday”), a Veltan lust idol (called a sex idol in “The Most Toys”), next to a broken Bajoran Reckoning Tablet (DS9: “The Reckoning”). Apparently, Orions lived in childhood slime dungeons. Yorif uses a ST II design phaser and claims his ornate facial piercing is “prescription”. 

The LD title has the 3D effect that was applied to TNG’s title which appeared only in Season 5. The ever-crowded battle in the title sequence is joined by Apollo’s hand (TOS: “Who Mourns for Adonais?”), which grabs the Borg cube, a Tholian ship drawing its web (TOS: “The Tholian Web”) and V’Ger (TMP), complete with its sound effects.

Mariner is playing a game of Vulcan kal-toh with T’Lyn. Boimler’s Fleet magazine, aside from the “30 Under 30” feature, also highlights “Klingon Kouture: Blood is the New Black” (an allusion to Orange is the New Black, which also starred Kate Mulgrew), as well as “Q Who? The Continuum Awaits”(alluding to TNG: “Q Who?”). It also mentions “Treknomics”, which is an out-of-universe term used to refer to Star Trek economics. The cover also somewhat resembles the official Star Trek Explorer magazine published by Titan Comics. It is issue No. 47, a recurring number and in-joke in Star Trek. 

Naomi Wildman was born on Voyager in 2372 during its sojourn in the Delta Quadrant, the half-Ktarian half-human daughter of Ensign Samantha Wildman who was pregnant when she came on board. This dates this season around 2382. Tendi mentions it’s been “months” since the end of Season 4. 

Worf encountered a quantum fissure in TNG: “Parallels”, which sent him on a journey through several parallel realities, including parallel Enterprises. D’Erika says that the Orion warship (later we find out it’s a medical frigate) dates from the time of the Great Plague over 300 years prior. Roger Korby’s claim to fame was his translation of medical records from Orion ruins that revolutionized immunization techniques (TOS: “What Are Little Girls Made Of?”), but I always imagined the ruins to be older than a few centuries. 

It was established in “Parallels” that quantum signatures differ from universe to universe. In this case, the parallel that Cerritos is in exhibits only a .327% variance. Among the differences in hair (and in Otherford’s case, cybernetic augmentations), the parallel Billups is King (where our Billups rejected the throne) and has Hysperian accessories over his uniform, like Worf used to wear his sash over his. 

We finally find out that Mariner is her middle name, so she was born Beckett Mariner Freeman. She went by "Becky" when living on Starbase 25 (LD: "An Embarassment of Dopplers") and her father still uses that name (LD: "Grounded").

The globes at the rear of the Orion frigate are like those spinning at the rear of a D’Var type Orion scout ship (TOS: “Journey to Babel”, SNW: “Those Old Scientists”). Blue-skinned Orions (actually light green) appeared only in TAS and were the result of coloring problems in the animation (Hal Sutherland, the director, was colorblind, also explaining why TAS tribbles are pink). Also, the odd pronunciation of “Orion” by the blue-skinned Orions here (“OR-ee-on”) comes from TAS: “The Pirates of Orion”, the mistake being due to an absence of a pronunciation guide.

Captain Becky says “there’s no interpersonal conflict allowed on my ship!” which was Roddenberry’s edict for TNG. Mariner also mentioned that people weren’t supposed to have conflict in LD: “Strange Energies”. Becky also uses a riding crop - in LD: “First First Contact” Mariner said she didn’t want a new captain because potentially they could be “some weirdo with a riding crop”. That was likely an allusion to Captain Styles (ST III) using a swagger stick. 

As she goes to replace Mariner, Becky uses the sarcastic Vulcan salute first seen in LD: “Moist Vessel”. We find out that the parallel Captain Freeman ended up at the infamous Starbase 80 (first mentioned in LD: “Terminal Provocations”). 

The Blue Orions say they are laughed at for their “ridiculous uniforms”, which were a product of TAS design. As Parallel Boimler goes to take his seat as Acting Captain, he does a reverse Riker Maneuver out of the conn chair. 

At the bar next to Ransom is a bottle of Cardassian kanar (DS9: “The Marquis, Part II”). In front of Boimler is a raktajino mug seen in DS9, in reality a Highwave Hotjo 16 oz. Travel Mug.