starting at 32:10 and going up to 1:29:20 we see a long list of things that apparently must be "renounced" publically as in "I renounce this teaching" -- to join certain Orthodox churches. (Which suprised me somewhat). And a lot of those things are specifically stated to be Roman Catholic - that the these Orthodox groups say must be renounced as heresy.
Now normally I would say "fine we expect some differences like that since they are different denominations" (Though I find it very unusual to have "I renounce this-or-that" in the actual liturgy of a christening or baptism or profession-of-faith vote into membership - for other denominations).
The reason I bring this up is that now and then in the General Theology forum we see complaints about "sola scriptura generates all those Protestant Denominations" as if there is no denominational difference in doctrine between Catholic groups and Orthodox groups - while claiming the
"sola scriptura" doctrine is what creates differences and so Catholics supposedly have no such difference with the Orthodox groups as one might find between certain Protestant or Evangelical groups.
BTW - check out this post for a further point on SS vs tradition.
But the video in this OP appears to "shed more light" on that detail than one normally hears about in the General Theology forum.
From the video evidence here it appears their differences are as significant as any other difference between lets say Baptist and Presbyterian etc. In fact the Orthodox/vs/Roman Catholic list of "I renounce" may be much larger than one would find between Presbyterian and Baptist.