During the annual the Rangers are captured by a monster so Zordon and Alpha are forced to enlist two new Rangers. Who do they pick? Bulk and Skull. Behold the Purple and Orange Rangers.◊
Even funnier, a later variant cover of Forever Gold features all the past gold Rangers...and Skull. This means, that if one were to take the comics as canon, Skull was the first Gold Ranger to appear on earth. Adding on to this, a "Forever Purple" cover included Bulk's Ranger which also makes him the first Purple Ranger on Earth!
In issue 13 has Finster more or less hitting on Goldar while he's crafting a new form for the other monster, complimenting Goldar on his form and admitting that he made Goldar stay around longer than he needed because the craftsman gets lonely while he works.
In an otherwise very serious flashback, the artwork makes it very clear that of all monsters, Pumpkin Rapper was instrumental in the downfall of the human race.
Kyle Higgins has made it clear this is absolutely intentional, and uses Pumpkin Rapper at any opportunity he gets. Including playing Pumpkin Rapper, complete with rhymes, when guest starring on Power Rangers Hyperforce.
The 2017 annual has a story where Scorpina and Goldar decide to goof off for the day and end up attending a carnival after Scorpina was offered a coupon for free taffy. We then see that she's made Goldar carry all the prizes she's won and he then wins a toy of himself, and gets very angry when a monster that Rita had sent down ends up destroying it.
Goldar: Your tiny Goldar shall be mine! (Later, when the toy is destroyed) Goldar: You have disrespected both Goldars GREATLY!
Goldar's Paper-Thin Disguise has him wear normal clothes over his armor and he makes no effort to hide his face or the fact he has a tail. Even better, it doesn't even seem to fool anyone; they just think he's got a really great Goldar costume.
And when they praise Goldar's "costume", there's one single person who says "I've seen better." This person is Scorpina.
The monster at the beginning of issue 23 spends the entire fight screaming about conspiracy theories. Including that there's only one Olsen Twin.
In an interview released the week before Issue #32, Marguerite Bennett talked about having too much fun with a page of Heckyl and Kim verbally sparring/flirting about them both being reformed villains. She revealed that the artwork was so reflective of this, she got a note back saying "Can we pull them farther apart and leave some room for Jesus?"
The page in question also has Heckyl straight up asking Kim if she sees anything she likes. Her response? A skull and crossbones.
GGPR #16 has Billy, Kim, and Zack swapping their powers. Jason warns the others that it might take a second for them to get used to the change but is interrupted by Billy:
Billy: I'm fighting aliens on another planet! I'm fighting aliens on another planet with an axe! That's also a cosmic cannon! This is the greatest day of my life! Jason: Okay, maybe it won't take a second.