The staples used in the stomach and the intestines are very tiny in comparison to the staples you will have in your skin or staples you use in the office. Each staple is a tiny piece of stainless steel or titanium so small it is hard to see other than as a tiny bright spot.
Most people are not allergic to the staples, so they usually do not cause any problems in the long run. The staple materials are also non-magnetic, so they will not be affected by MRI.
The staples will not set off airport metal detectors.