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

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, Villainous Benchmark Wiki

Feathers McGraw Villains+BreezeWiki

Feathers McGraw Villains+BreezeWiki

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

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

The Wrong Trousers (Nick Park, 1993) – Film Studies – Sam Barrett

In Wallace & Gromit: The Curse of the Were-Rabbit (2005), you can see that the penguin Feathers McGraw who appeared in the short film 'The Wrong Trousers' makes a cameo in the

Feathers McGraw Villains+BreezeWiki

The moment Gromit realises Feathers McGraw is trouble

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Feathers McGraw/Gallery, Villains Wiki