Something else I noticed, after watching, rewinding, and stepping through parts of Meg 2 - Jason Statham's Harpoon Continuity Person needs a refresher on introductory subtraction.
Context: leaves beach on jetski, to save the world from Megalodons, equipped with 3 harpoons strapped to his back.
1:25:45 - 2 harpoons on back, 1 in hand
1:25:51 - throws harpoon #1
1:25:55 - 3 harpoons on back
1:25:57 - NO harpoons on back!
1:26:13 - throws harpoon #2
1:26:24 - 2 harpoons on back !!!
1:28:05 - 1 harpoon on back
1:29:14 - holding harpoon #3