Woohoo

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The Hollywood Chamber of Commerce holds two trademarks that are important symbols of Hollywood. They include the iconic Hollywood Sign and the world-famous Hollywood Walk of Fame star.

How much does it cost to license the Hollywood Sign?
There is no need to pay. As one scholar explained, these creative works don't violate trademark laws when they simply show the Hollywood sign to signify that “the scene took place in Hollywood.” That's called descriptive fair use.

So it is a trademark. Seeing it is movies, it is just location or a photo or whatever, but drawing it in a cartoon might be the same as using the trademark for your own commercial goals.

I can never ever figure out the difference between copyright and trademark.

Maybe that's why I never became a lawyer. 

If you see a ™, be careful. If you see a ®, then run away. If someone can afford having the registered symbol, they have enough to sue you for just saying their name out loud.

If you see a ©, laugh. You need to seriously step on someone to get sued for a copyright infringement.