Continuity mistake: When the Warners have Mr. Director pinned against a wall wielding their weapons of choice, Yakko's paddleballs disappear between shots.
Continuity mistake: When the Warners hide behind some wooden crates in Mr. Director's studio, the largest crate changes style between shots (note the new diagonal planks attached on both sides).
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Continuity mistake: When Mr. Director first meets the Warners near a buffet table, his chair disappears for a shot, only to reappear moments later.