I've read somewhere that James Cameron almost always includes a close-up of a boot or of a wheel (usually crushing something) in all his movies. But is there such a close-up in Titanic?
Not a boot as such but it does seem that Cameron has something about feet or establishing shots starting from ground level.
There are a number of shots in Titanic which start with feet/footwear.
This YouTube video covers a lot of these shots with the Titanic ones at 3.10