My late father flew 'Cats' with the RAAF throughout the Pacific from 1941 into 1946.
Among his more interesting missions were 24 hour flights as far a field as Indochina (Viet Nam) and 'hairy' mining operations into Truk Lagoon, finishing with POW evacuations well into 1946.
The bow eyeball turrets (made by Ryan or Fletcher????) carried 2x30 cal Brownings, the original flat topped version initially (in RAAF service) was armed with a .303 Vickers K gun, replaced very swiftly by a single .30 cal Browning.
The depth bombs???
Artistic licence indeed, without JATO any Catalina would need several miles to attempt flight, especially with extra charges added to the under wing load.
I know from Dad's log book that they used around 7+ miles to get airborne carrying 2 standard torpedos and several more miles to reach their operational altitude!!
The very best of the Catalina publications I've read would be 'In The Hands of Fate', written by Dwight R Messimer, published by Naval Institute Press, and tells the story of Patrol Wing Ten, December 8th to May 11th, 1941.
It is better than any fiction could ever be.
Of course, 'Catalina Chronicle - A History of RAAF Operations' by David Vincent is a bit dry but is interesting from my point of view, while 'Flying Cats' by David Hendrie gives an overall view of all operators during WW2.