When Sabine shoots her grappling line at Kanan, the coil wraps around him, with the portion leading back to her wrist coming off his left shoulder. When the scene cuts away and then back, suddenly the lead is over his right shoulder.
Kanan forces Sabine and Ezra to perform her lightsaber training with wooden sticks before she's allowed to use the real thing. When Kanan trained Ezra in season 1, it was shown that their lightsabers had a "training" setting that allowed actual lightsabers to be used for instruction without the ability to do real harm. There should be no need for Sabine to train with a stick instead of an actual lightsaber. Even if the Darksaber, being an ancient model, might not have had a training setting, Kanan could have lent Sabine his lightsaber while she practiced with Ezra and had her use Ezra's while sparring with him.