Stallone suggested real fighting during Rocky IV filming, resulting in his hospital stay after being hit by Lundgren.

The claims about the Rocky IV filming incident have varying levels of corroboration. The claim that Stallone suggested real fighting lacks external evidence, resulting in an unknown status. However, the claims about Stallone being hospitalized and staying in the hospital for nine days after being hit by Lundgren are supported by multiple medium-reliability sources such as The Hollywood Reporter and Business Insider. This suggests the events are generally accurate, although the exact duration of the hospital stay as reported varies slightly (eight vs. nine days).