Inside her ship, Ahsoka is holding a cup in her right hand when she says "Perhaps this will help". Then the angle changes to a wider shot and now the cup is in her left hand.
The droids initiating the self destruct sequence are 2. When Ahsoka is running to avoid the explosion and the camera goes back to the droids there are 3 droids ready to explode.
When Baylan Skoll is deflecting blaster bolts with his lightsaber, he turns it to point to his left. Then the camera angle changes to show him from behind, and now the lightsaber is pointing to his right.
While technically Ahsoka is not a member of the Jedi Order, nobody left really is as the Jedi Order was destroyed as a cohesive organization at the end of the Clone Wars and isn't really established until after the events in Aksoka. As far back as The Empire Strikes Back it was established that the "too old to train Jedi" is more of an old Jedi Order preference/prejudice than a fact rooted in Force abilities. Luke Skywalker himself received no serious Jedi training until his 20s. Desperate times called for a relaxation of the old rules.
The recorded message that Sabine plays of Ezra makes reference to his own disappearance, which doesn't make sense as Ezra has been missing (in another galaxy) with no way of transmitting a message to Sabine since the end of Star Wars: Rebels (2014).
Ezra knew that he was going to have to leave the group to stop Thrawn, whether through a vision from the force or just heightened senses and awareness so he left two messages one that the remaining crew played in rebels on the last episode (he spoke about needing to do this and that he couldn't wait to come) and now this message. Both were left before he disappeared hence why he spoke about his disappearance.
Ezra knew that he was going to have to leave the group to stop Thrawn, whether through a vision from the force or just heightened senses and awareness so he left two messages one that the remaining crew played in rebels on the last episode (he spoke about needing to do this and that he couldn't wait to come) and now this message. Both were left before he disappeared hence why he spoke about his disappearance.
Ezra's message to Sabine makes reference to them being like siblings and growing up together in the Rebellion. In Star Wars: Rebels (2014), where both characters originated, Ezra had a decidedly romantic interest in Sabine, and she was depicted as being several years his senior, often calling him "kid" to emphasize that she was too old for his advances.