Luxembourg 1973

During the first song, the song from Finland, "Tom Tom Tom", performed by Marion Rung, there was a failure in the Eurovision Network that made the transmission sent to all the participating countries suffer from heavy interference for around 9 seconds in which the song couldn't be seen or heard, and consequently recorded, in any country, including the host country. As the interference happened during the second bridge of the song, what most TV stations decided to do with their recordings was to crop the whole bridge altogether to make the cut as subtle as possible when playing the whole song. This means that more than around 30 seconds of the song are missing from most copies of the show. The crop is so subtle in most cases, though, that not much people know about this fact.

During the Spanish Entry (Mocedades with Eres tú), the voices weren't well equalized. Due to problems with equalizers, they had to turn down the volume of all mics except Amaya's, so the background vocals were too weak.