All of these pairs are considered by Unicode to be the same character but have different renderings in Chinese vs Japanese fonts. (I’m using <span lang="zh"> vs <span lang="ja"> here, so if your computer has both fonts available they should look different.)
八／八
直／直
約／約
刃／刃
骨／骨
船／船
令／令
今／今
悔／悔
There’s probably lots more I don’t know about, but I think 直 is the only one that is a little harder to to guess.
(I stole this list from Kanji Fix’s screenshots - speaking of which, that app may be useful to you, depending on what Android device you have.)
There’s also pairs like
两／両
學／学
國／国
晝／昼
but Unicode considers them to be different characters so you shouldn’t see them mixed up.
