Franchise: Star Fox

Pigma Dengar's surname is a reference to people in Japan with a Kansai dialect. In the Japanese version of Star Fox 64, Pigma speaks with a Kansai dialect. People with the dialect tend to end their sentences with the word 'dengar'.

ROB 64 in Japan is called NUS (ナウス) 64 and is named after the Nintendo Ultra Sixty Four, the original name given to the Nintendo 64 console. NUS also appears in serial numbers of various Nintendo products.

The Legend of Zelda: Majora's Mask contains a reference to the Star Fox characters. Once you have all of the Happy Masks on the second row, you can see the Star Fox team (and one of the enemies, though he used to be a member of the team before betraying them).

In order:
Keaton Mask = Fox
Bremen Mask = Falco
Bunny Hood = Peppy
Don Gero's Mask = Slippy
Mask of Scents = Pigma

All of the Star Fox pilots have robotic legs. It is theorized that they had their legs amputated to prevent blood from rushing down to them in the high G-forces they would experience, causing them to pass out. Modern day pilots wear tight fitting clothing around their legs for the same reason.

There were four canceled Star Fox games.

The first, planned for the SNES, was a sequel to the original game and titled "Star Fox 2". It was completed, but its release was shelved in order to continue the series in 3D on the Nintendo 64 with the release of Star Fox 64. Star Fox 2 would eventually see an official release on the Super NES Classic in 2017.

The second was a Virtual Boy release titled "Star Fox" which was canceled due to the poor sales of the console.

The third was a Star Fox game for the Wii, which after years of being talked about ended up being cancelled for unknown reasons.

And the last was an arcade version (also titled "Star Fox"), though very little is actually known about it or why it was canceled. The only known image of this game is shown in the attachment.

The barrel roll as seen in Star Fox is not a barrel roll at all, but rather an aileron roll. It's only in Star Fox: Assault that you can actually perform a barrel roll.