Some things that don’t translate:

“It’s growing on me.” Nope, you cannot use the verb crecer to say that you are becoming more fond of something; I tried…

The importance of distinguishing between estar and ser. If you want to ask someone “If you were an animal, what animal would you be?” you use ser, not estar. Apparently, if you use estar, the person will think that you are asking them what animal they are with, as in, what animal are they sleeping with. Yes, I learned this one the hard way. However, I think the real question should be why bestiality is SO commonly discussed that use of the wrong ‘to be’ verb would yield this confusion…