Chûgoku kara kita aitsu! Chotto hen!! - S1-E1
Other mistake: When Ranma is battling Genma at the very beginning, she slides into the main road. Behind her is a vending machine for drinks, only, it's marked "DOLINK" (bad transliteration). (00:03:00)
Chûgoku kara kita aitsu! Chotto hen!! - S1-E1
Other mistake: In the sparring scene, Akane is at punching distance from Ranma, then decides to get serious and tries to hit her with a heavy blow running towards her a few steps, without having moved back. (00:09:45)