A post in /r/uktrains "Did anyone notice the error in the Wallace and Gromit special yesterday? This signal is ‘off’ (proceed aspect), but the light is shining through a red lens (stop/danger aspect). This is because the animators have made an upper quadrant semaphore signal, but have given it a lower quadrant spectacle plate! originally posted in a signalling Facebook group I’m a part of, so can’t claim credit for spotting this first" The image is a still of a scene from Wallace & Gromit Vengeance Most Fowl: a semophore signal by a grassy slope with shrubbery and an old metal "25" speed sign.
https://cdn.masto.host/crispsandwich/media_attachments/files/113/718/595/455/758/185/original/012d8d3dba6e518a.png