An extra story set in the Galactic Era 1111, a hundred or so years before the events of the main story. Ex. Who Killed Who?.

I believe this is a reference to The Hitchhiker’s Guide to the Galaxy.
Specifically 42, the answer to the ultimate question of life, the universe, and everything.
42. Answer.

Have any of you wondered if, one day, at the end of humanity, we would send something out similarly? 41. Tomorrow.

40. The Door Into Summer is a reference to a sci-fi novel of the same name by Robert A. Heinlein, published in 1957.

I’ll be damned if this isn’t a Gundam reference. I’m 100% sure this is a Gundam reference.
39. G-Type.

One of the few weapons in this museum with a decent track record of use. 38. Afterglow.

37. Wouldn’t They DIe? Yes actually, yes they would.

I’ll be honest, this might be a terrible replica and a terrible milltary weapon, but it still sounds dangerous as all hell. 36. A Disappointment for Weapon Enthusiasts.

The Cold Equation is a reference to a sci-fi short story by Tom Goodwin in 1954.
An Intense Heat Equation would be something of the opposite. 35. Intense Heat Equation.

Red Spider Lilies, Cluster Amaryillis, Higanbana, however you like to call it.
It is known as the Japanese flower of Death. 34. Red Spider Lilies Bloom in the Graveyard.