Numbrs Software Engineer Android interview questions

Generic quesions about experience and Android fundamentals. I've been presented with a simple code to review and asked if there were bugs (there were). I've been also given a "test project" with some mandatory requirements and "bonus points". Completing the project including "bonus points" took me almost a week, while they estimated that it was a project for a few hours only. The interviewer did not review my project prior so I was asked to guide the interviewer throgh it during an interview. It seems like most of the effort was wasted because no one saw the fine details I have put.