The Seven Crystal Balls: Part 1 - S3-E3
Plot hole: Two clown performers finish their act and the curtain closes. Tintin and Haddock then talk for a bit about who will be performing before the musician, but within the span of merely just a few seconds, the next act is suddenly on stage and ready to perform. No way could the clowns have left the stage and the next act have been set up within that short of a time span. (00:04:45)