The efforts made to really look after the quality of the sound both during the shoot as well as after-wards in the post-production phase proved to be insufficient. It turns out that in the previous scene, a seemingly quiet one with the only 'noise' being the dialogue between Laia and her friend having a conversation in the hallway of their high school building, we hear nonetheless the not so subtle thuds of the boom coming into contact with either the wall or the floor and no luck in cleaning it up in post-production. When that scene comes on the noise can still be heard, if only a little.
The plot having taken place in a high-school, at some point during the shoot it was decided that we should film the exterior facade of the building. This was done in hopes that spectators abroad would not figure out that what they were seeing was in fact the ESCAC film academy, as can be read so clearly in this particular shot.