I dont know anyhting about it, but I can see that there are two separate layouts shown; One that looks like Märklin vintage in the background, and another one that is 2-rail, with working trains and a moving truck with lights.
In the end-scene the "dad" is gifted a vintage Märklin lok (BR81). Its seems like they are trying to hide the slider/ski at first, but later it is clearly seen. No Märklin user would ever press the slider fully into the frame of the loco, in order to hide it.

My bet is, that these are borrowed existing layouts, rather than build for the show; They are both handy small layouts, easy to set up and store away for X-mas.