I sometime write something in English that might intervene it some slight mistakes. Is it correct to say that in English.
No, "intervene" is not the right word. " ... that might include a few mistakes."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
No. As Barb has already said, 'intervene' is not the right word.
Context is always important; labelling is rarely important.
How about:
Mistakes sometimes creep in when I'm writing English.