Here's an error correction worksheet on futures tenses. It's ideal for the intermediate level of students. The worksheet covers typical incorrect sentences with future simple, going to, future perfect, future continuous, and present continuous tenses. They are mostly the mistakes that my students do during my lessons and usually occur when students want to form future tenses.
This PDF set has also got an A-B version worksheets, which will be great for peer checking and reciprocal learning. An answer key is included.