Common mistakes to avoid when installing a drip irrigation system for indoor plant walls and atriums include inadequate tubing sizing, improper emitter spacing, and failure to account for pressure drop. It’s essential to ensure that the tubing is sized correctly to handle the required flow rate, and that emitters are spaced correctly to provide uniform watering. Additionally, pressure drop calculations should be performed to ensure that the system can handle the pressure requirements of the emitters and valves.