Audio problem: In the beginning, you can hear the sounds of the jungle, including the laugh of a kookaburra. The problem is: The film is set in India and kookaburras are only in Australia, not India.
Continuity mistake: When Mowgli is with the monkeys, Bagheera is on Mowgli's left, but then suddenly he is on Mowgli's right.
Continuity mistake: The large wound on Mowgli´s right knee is gone in the next days.
Other mistake: In the opening sequence, Mowgli is running at full speed through the jungle, accompanied by Bagheera the black panther, who is mostly unseen until Mowgli finally collapses, exhausted onto the jungle floor. Mowgli lies on his back, talking to Bagheera, and neither are breathing heavily or showing any sign of exertion following their lengthy run.
Continuity mistake: The wound that Mowgli gets from the tiger on his chest gets smaller at the end of the film.
Revealing mistake: Some scenes in the jungle involve heavy downpours of rain, but rain drops are not seen splashing on Mowgli or the jungle creatures.
Answer: It was a threat to Mowgli, hoping to lure him back in grief and to save the younger wolves from the same fate.