For something to be both meta and intertextual…
Not only is there a ‘nod’ to something else i.e. intertextual, there is also something deeper going on i.e. meta.
It may be the case you need other information beyond what is apparent to ‘get’ the intertextual and/or the meta reference i.e. it is not surface deep.
The example of the A-Team, and of the scene in ‘The Martian’ are ideal here – the extra information you need exist outside of the reality you buy into when you are watching the show/movie.
