While we’re talking about Marvel references, Hiccup’s prototype shield in the HTTYD TV series is possibly a reference to Captain America’s shield. Both are made from special metals that make them stronger and lighter in combat, Gronkle Iron and Vibranium respectively, and can act as a boomerang. Also, Hiccup’s fire-sword, Inferno, is very similar to the lightsabers from Star Wars.
I bet the new DreamWorks movie "Puss In Boots: The Last Wish" is a prequel to the Shrek series, since one (or should I say FOUR) of the bad guys are Goldilocks and the Three Bears and, like you said, Lord Farquhar made Mama Bear into a bear rug.
(I'm sure you watched it but...) It is not a prequel because at the end they go to see "Old Friends" in Far Far Away. Also, it is a theory the Papa Bear in Puss In Boots is the Baby Bear in Shrek.
In home, at the beginning when oh is in his apartment you can see a plaque on the mantle with the Indianapolis motor speedway logo on it. The name on the plaque is Guy Gagne, from Turbo.
In the original idea of the Madagascar authors, the character of Gloria was expecting puppies, which she would then give birth to once she arrived in Madagascar. However, the idea was discarded because it was considered risky to include this narrative line in a film designed mainly for an audience of children.
I think toothless is in abominable, the scene where it's near the ending where there riding the clouds you can see a cloud form as a dragon and look like toothless