In Wallace And Gromit: A Close Shave (1995) writing is seen on gromits cell reading FEATHERS WAS 'ERE, in reference to Feathers McGraw, the villain of The Wrong Trousers : r/MovieDetails

Short Review: The Wrong Trousers (1993) – Feeling Animated

In Wallace and Gromit: A Close Shave (1995) Gromit is reading Crime and Punishment by Fido Dogstoyevsky as opposed to Fyodor Dostoevsky, its author in our world. : r/MovieDetails

Feathers McGraw Villains+BreezeWiki

Feathers McGraw/Gallery, Villains Wiki

Animated Shorts: The Wrong Trousers

Animated Shorts: The Wrong Trousers

Why You Should Watch 'The Wrong Trousers' Tonight

In A Close Shave (1995), the evil penguin Feathers McGraw can be briefly seen on the cliff after activates his plane. There's also graffiti in Gromit's jail cell reading Feathers Was Here

Feathers McGraw Villains+BreezeWiki