Is it normal for the eye to still be a little inward after a lazy eye surgery?

Yes. It can be hard to get the alignment exact (tables to estimate the pd change based on mm movement of the muscle). Also if it's recent since surgery, there may still be some residual inflammation affecting alignment. Plus it may be incomitant so different in various gazes (hard to correct for every gaze).
It can be. Often, after surgery some residual strabismus may be noticed or even a slight overcorrection may be present. Usually, if mild, this presents little problem and in many cases can be corrected with glasses. Strabismus surgery is both an art and science.