The jagged lines on the doors looks like a optical illusion caused by high resolutions and small lines. In photoshop zoom in and see if they still occur.
You could just increase the JPEG quality?! As Silkrooster said, these are normal scaling artifacts with lines that are almost perpendicular, but not quite, and the JPEG compression does its share of damage. Using a higher setting will improve matetrs, but it will never go away completely.