Sjef van Oekel claims to celebrate his 12th (and later in the show, 12 and a half) anniversary on television, even though this is only the 7th Discohoek. Possibly he was including his two appearances on De Fred Haché Show (1971), three guest appearances on Barend is weer bezig! (1972) as well as the TV special Waar heb dat nou voor nodig (1973) in the equation. But that would bring the count up to 13.