How has nobody pointed this out yet?
In the first shot of the helicopter passing the Hollywood Sign, you can CLEARLY see that "Hollywood" is spelled "OHLLYWOOD." They switched the O's and the H's. And also, I'm not sure on this one, but it appears that the last 'O' and the 'D' are switched as well, making the sign actually say "OHLLYWODO". In the very next shot, when the chopper is shown passing directly in front of the sign, it's spelled normally.
I'm a reasonably intelligent individual, and I can't think of a single rational explanation for this. I'm also surprised nobody else has brought this up yet, too. Any ideas?