Yeah, lots of fun data issues can be found in their exploration tool https://charleskemp.com/code/lexicalelaboration.html

Icelandic has a bunch of dictionary abbrevations: medic(al), temp(us), germ(anic), veg(etation). Tarifit is dominated by linguistic terminology. German has a few German words that look like English words meaning something completely different (mantel, tier, boot, stall), one loanword (angst) and what might be dictionary abbrevations again: humor(ous), miner(alogy), spa(nish)...