[Agentlien]

Could you explain this play on words for someone who doesn't know Japanese?

[nihonde]

I'm guessing but 誤解 => 'go kai', which means 'misunderstanding'. That sounds like 五回 => 'go kai', which means five times.

In Japanese, you often encounter words/phrases that sound more or less the same but are written differently.

[ume]

Both the original Japanese (meaning 5 times) and possibly pun Japanese (meaning misunderstanding) are read as 'gokai'.