Plot hole: Ezra escapes from the Ghost crew through the ship's ducts. When the ship comes under attack from TIE fighters, he eventually falls out and into the nose gun turret. However, that turret is directly connected to the cockpit. There is no duct where he fell for him to fall out of.
The Protector of Concord Dawn - S2-E12
Plot hole: Sabine stowed away onboard the Phantom by hiding under the trapdoor in the shuttle's floor. That entry is just a single hatch, with nothing between it and the vacuum of space when the shuttle is flying. There is no way she could have hidden away there for the trip through hyperspace from the Phoenix Squadron fleet to Concord Dawn.
Answer: Not every military vehicle looks or is built exactly the same, even if they perform similar functions. Different defense contractors would have their own particular designs. Newer vehicles often have improvements or additional capabilities added.
raywest ★