TC's helicopter changed during the surveillance of the boat. At times it was N1095A which is normally his helicopter and more often N58243 which has thicker skids.
Magnum pretends to photograph the priest while zooming over Paddy's shoulder to take pictures of the unfaithful wife and her lover. The lens on his camera is a 1.8/50 with a fixed focal lens that can't zoom.
When Magnum takes photos of whales from T.C.'s helicopter, the lens is an 8.0/500 fixed focal length mirror telephoto, which can't zoom.
In the UK there is no such thing as the Royal Army.
Higgins claims to be descended from a nephew of Edward VI. Edward's only legitimate siblings were the Queens Mary and Elizabeth, both of whom died childless; his illegitimate (but acknowledged) half-brother, Henry Fitzroy, died aged 17, also childless.