Not in the least bit surprised that Avatar climbed past Titanic, (my review of the movie is here) but the news did prompt a great thread on Reddit about these cinematic curiosities:

Make with the clicky to embiggen and you’ll see it was Lucas’ way of tipping the hat to Cameron back in 1998. But the Redditors pulled out a few more in response:

Great stuff. Here’s ET and R2-D2 too.

I always liked the little friendly digs that crop up in actual movies like the ripped posters in Evil Dead, The Hill Have Eyes and A Nightmare on Elm Street related to raising the horror stakes, but these were new to me. I guess eventually a full set will pop up on Reddit. Keep your eyes open.