PCB design - signal loops
Trace loops are an excellent way to introduce noise to your lines. Either it is from a ground or a &quot;positive&quot; trace, magnetic flux that passes through the loop will induct a voltage to the resistance of the copper trace, which eventually will add up to your &quot;normal voltage&quot;. Such magnetic fluxes can be due to power grid (50 or 60 Hz), low-end SMPS, rf signals, etc.
An excellent source for information about pcb design is analog's Linear Circuit Design Handbook (which is free to download) and from which is the following Figure

The traces you have pointed out are indeed loops. I hardly believe that they will create any notable noise, since they are small, but it is always a good practice to avoid them.