Iker Jiménez, famous Spanish journalist and supernatural investigator who created and hosted the TV show Cuarto milenio (2005), voices in cameo an animated version of himself. For the English release the character, voiced by Joseph Balderrama, was changed to an animated version of Giorgio A. Tsoukalos, another journalist and also supernatural investigator famous after his TV show Ancient Aliens (2009). Altough Jiménez and Tsoukalos don't share a great physical resemblance, the design of the character allowed the change of identity with no problem.
In the English dubbed version of all three films of the franchise, Tad's surname has changed from Jones to Stones.