The scene where Surak attacks Chuluun was recycled from The Lake of Reflection.
The scene where Kion looks at himself in the lake, along with the song "Remember What Makes You You", are references to two scenes from the original movie: Rafiki showing Simba that Mufasa lived in him, and Mufasa's ghost telling Simba to "Remember who you are".
During the fight against Makucha's Army, Ora is clearly seen spitting out a red liquid from his mouth as he is being sprayed by Bunga's stink. Given that moments before he had bitten Besthe on the leg, it is very likely that Ora was spitting out Beshte's blood.
As of October 29, 2019, the scene was edited so that Ora would be spitting out more of his saliva, presumably because such a graphic and lengthy display of blood would be considered dark and inappropriate for a Disney Junior show.
At the time of its release, this marked the second time that blood had been explicitly shown in The Lion Guard (the first being moments after Kion received his scar in "Battle for the Pride Lands"). However, compared to Kion's injury, this marks a rare instance in which blood was shown graphically on a Disney Junior show.
This episode had an average of 389,000 viewers.[1]
It's implied that Kion is healed of Ushari's venom in this episode, as Nirmala claims the scar to only be skin deep rather than addressing the venom itself. Mufasa even questions if Kion is healed upon learning of Kion's boost in confidence, which would indicate that the venom is no longer in Kion's scar. This is later confirmed by Nirmala in the following episode.