Continuity: At the end of Rocky IV, Rocky's son Robert is around 6 or 7 years old. After Rocky comes back from Russia in Rocky V, his son is around 12. While there was a 5 year interval between Rocky IV and V, no time had elapsed from the two in movie time. So, therefore, his son should still be the same age given that Rocky has just recently fought Drago, "The Russian" considering his bruises, and they all returned home right after the fight.
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Mistakes
When Rocky delivers the final uppercut at the end, the punch misses by inches. See more...
Rocky V mistakes
Continuity: In Rocky V, the boxer in the sign at Mighty Mick's Club is looking right at you, but he is looking at his left shoulder in the past Rocky movies.
Revealing: When Rocky delivers the final uppercut at the end, the punch misses by inches.