Twice in the book, Beshte is missing the hair on his head.
Multiple times in Return of the Roar, Janja, Cheezi, and Chungu's ear notches are all flipped. In addition to this, Janja at one stage appears as a character resembling Shenzi, a character from the original movie, The Lion King.
On the twenty-sixth and thirty-third pages of Return of the Roar, Fuli's eyes are turquoise rather than green. Simba's design is replaced with Mufasa.
On an early cover, Ono and Fuli's Mark of the Guard are shown on their right instead of their left. Although this was fixed for the final release, the Spanish release still shows Ono's Mark of the Guard on the wrong side.
On the cover for the French book ("Verte" edition), Ono has been moved and is vanished his Mark of the Guard.
Zazu appears on page 6, with Kiara and Kion approaching him, despite him having already left for Aminifu's funeral with Simba and Nala. On the next page, Ono is with them instead.
Janja's ear notch appears on his right ear instead of his left.
Janja's clan of hyenas is mistakenly referred to as a pack.
On page 21, Kion is missing his spots on his legs.
On the first page of the comic, Janja is depicted with a red nose and with his ear notch on the wrong side. Additionally, he is shown to be to the right of Chungu, while he was shown as being to the left of him in the previous panel.
When choosing between Ono and Beshte's ideas, Kion's markings are vanished from his legs.
On the first panel, the two speech bubbles point to Beshte and Kion. However, when hearing about how they're the best Guard, Zazu answers Bunga, meaning the two speech bubbles should be pushed further right since they actually belong to Kion and Bunga respectively.
In nearly every shot, everyone's Mark of the Guard is missing the eye.
Also, when Zazu speaks of another challenge, Bunga's Mark of the Guard is on his right shoulder instead of his left.
On page 7, Ono is missing his Mark of the Guard. In addition to this, Beshte has a notch in his right ear. Finally, throughout the comic, Bunga's Mark of the Guard is colored a much darker blue than usual.