From the good folks at Smash, the Broadway themed TV soap opera, here is a photo of the Lily Hayes Theatre, home of the fictitious musical "Bombshell". The Lily Hayes is played by the Lyceum Theater.
If you look closely at this picture, you can see the CGI "make-up" applied to the theater to transform it into the "Lily Hayes". The renamed marquee is unremarkable, but look at the three supplemental marquee displays above the overhang. They are oddly attached to old style glass windows with no physical means of support.
This scene only appeared for a few seconds on screen, but I had to check this out because in the flash of time I saw it, something just did not seem right. I guess this would be the equivalent of those Photoshop magazine cover disasters that show super model wrists or elbows oddly bent or angled in some crazy inhuman way.
Hooray for Hollywood!