The "L" is different than most examples I recall seeing, but then again, can't say I was analyzing those or anything more than just general viewing, when looking over a seller's wares, nothing specific. What does strike me is that I only remember seeing examples where the Ls weren't as much two distinct and separate Ls, but those Ls were like an amalgamation of two Ls in one, almost like a Heraldic or "Olde English" Captital L that looks more like one capital "H", or an L + 1 rather than two separate characters on your piece, a Captial L and then a neighboring script "l".
Other than the "L" and a few other minor variations that you already mentioned, I don't imagine it being suspect. It's not a high dollar auto, so I imagine not as subject to the type of forgeries that the usual high dollar signatures that abound in the industry. I'd say decidedly more "yay" than "nay" based on there being more similar signature characteristics than dissimilar, on a whole, and the chance of forgery being being minimal, based on monetary factors.
A flexible and successful character actor, he's played integral roles in lots of movies! He was fantastic in Cuckoo's Nest. I'd love to have a signed cast poster of that one. Fantastic acting from all.