Ken--
You're right! Watching the YouTube movie (with stop action!) yields tons of detail, curiosities and avenues of investigation.
Yesterday I slow rolled the film several times and was stunned to see how many "Hollywood" noses were included in the filming. There is (Robert Mitchum's) "Turkey"...one called "Our Little (Mermaid?)" and another called "American Beauty". These last two appear in the flight deck scenes.
There are also two different Ruptured Duck's. There is the one used in all the flying sequences and the other in the sound stage (carrier deck) sequences.

I also ran the tail numbers on all the planes that appear in the movie and find them all to be B-25 D's.
The flying sequences for the Duck are done by 41-29754 both before and after the Duck gets nose art. (The flying Duck is always identifiable by the wide dark color streaks radiating aft through the Ducks head.)
Some notes:
Opening flying sequence "0-2241 requesting traffic and landing...")
Landing/Taxi Sequence: 41-30137 (North American B-25D-5 Mitchell )
: 41-29754 (North American B-25D Mitchell ) "Lawson" plane without art
Short Take-off Practice Sequence: ("Gray/Manch" 41-29911 (North American B-25D-1 Mitchell)

"Lawson" taxi: 41-29754) (Tail skid sequence: 41-29754)
Alameda Arrival (with Duck art): 41-29754
"Night air" sequence: 43-3729 (North American B-25D-35 Mitchell )
Carrier take-off Sequence: 41-29911 (North American B-25D-1 Mitchell [in block modified as F-10's])
132874 (not a B-25 sequence tail number--movie make-up?)
Bomb run Sequence: 41-29754 (with Duck art)
40-2344
40-2292 (Van Johnson mis-counts planes and pilots leaving out Hallmark...)
40-2270 Gray (TSOT: "You up ahead?"..."4th spot!") (TSOT: "There goes Bob"--shows 2247/Avenger)
40-2282
40-2283
40-2298 (TSOT: "There goes Hallmark"--shows 132874
40-2261 Lawson/Ruptured Duck
40-2242
40-2303 Watson/Whirling Dervish
40-2250
40-2249 Greening/Hari Kari er
40-2278
40-2247 McElroy/Avenger
40-2297
40-2267
40-2268