Trussing Door has twelve letters.
Lemy the Lizard has thirteen.
Lemy is also green, and we know Door was incredibly envious.
Given the numerical proximity of twelve to thirteen, it's safe to say that Door was a very unholy individual, lacking faith and without proper moral guidance. Too close to the unlucky number, he was. And, as we know, he was a pathological fedora tipper.
Therefore, I have reached the vindicated conclusion that - since we are coming up to Hallowe'en - Lemy is the unholy manifestation of Door's godless spirit, which possess him and forces him to make ungodly claims about other users.
Pray for Door. Pray for his damned soul.