Apollo's shuttle indicator shows a loaded weight of 2250. Just before Charybdis climbs aboard, without anything else having been added, the weight shown is 2425. After we see him stepping aboard the shuttle, we cut to the weight indicator changing to indicate his additional weight. It stops at 2425.
Starbuck's weapon is identified as the murder weapon because it is depleted by the same number of "ergons" as were used to kill Ortega. The investigator test fires the weapon. If each shot depletes ergons, a test fire would mean the weapon could not match.
The stock footage of Apollo's shuttle was printed backwards, reversing the shuttle's markings.