And the Fandom Rejoiced: Season Four's coming! Donkey Kong's back! Pauline and Max Payne have joined! Brock and Waluigi will return! Wario willl return to being a Large Ham! YES!
Season 5 has Bowser returning! Ganondorf coming into the story! Promise of epic battles between three armies including Ninjas and Pirates (two of which are evil)! Pauline and Blaire are resurrected!
Hilarious in Hindsight: In Episode 7, after reading Bowser's letter, Mario says (in relation to Bowser's mention of eating a goomba), "Imagine being in Bowser's digestive system!" Coincidentally, one and a half years after this episode was released (which was 2008), the game Mario and Luigi Bowsers Inside Story was released (in 2009), in which the brothers spend most of the game traversing Bowser's body.
Hype Backlash: Season 5 to an extent. It left Richard really upset as he believed he had wrote the best season ever for the finale and having read the negative reviews really bought him down.
I Knew It!: Wario being the second Chosen One was one of the main theories of the fans
Narm: The blood effects used in one of the later season 3 episodes may come off as a childishly gratuitous attempt at Darker and Edgier. The creators may have realized this, because for some reason future fight scenes lack this effect.
Then in the finale, it is revealed Mario was significantly weaker during that fight.