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I am defining illegal as it is in this answer, specifically the following

  • Studs-on-side bricks cannot have their side stud in the hole of a technic brick
  • Bricks mounted SNOT style onto Ehrling/Headlight bricks cannot sit directly above a normal stud (the minimal height of the LEGO embossing makes that combination illegal)
  • Technic pins have to be fully inserted into technic holes, otherwise they stay in compressed state which causes stress on the element.
  • Plates cannot be inserted with their studs into technic bricks, unless it is a 1x1 plate (so only 1 hole is used) and there is no brick attached to the technic brick directly above the inserted plate.
  • As mentioned by you already, you cannot insert plates between studs (this used to be a valid technique 20+ years ago, but is no longer considered "legal" by LEGO).

I am also including one other situation:

A round piece between four studs as stated in a comment by Sandra.

When, if ever, have any of these methods been used in an official Lego Build?

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    Have you checked presentation made by LEGO designer Jamie Berard posted in the same answer you are referring to? It has examples. – Alex Mar 27 at 6:47
  • Yeah, that file even shows a few (old) times when lego used an illegal technique. Although after each time they admitted that it's illegal. – mindstormsboi Mar 27 at 14:24
  • Does this answer your question? What are some "Illegal" LEGO combinations? – Alex Mar 27 at 18:13
  • @Alex I literally have an answer to that question linked. – CATboardBETA Mar 27 at 20:15
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    If the question were about the different types of illegal techniques, it would indeed be a duplicate. But it asks about usages of such techniques in official sets, which is completely different in my eyes, so I vote leave open. – zovits Mar 28 at 14:29
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As mentioned by you already, you cannot insert plates between studs (this used to be a valid technique 20+ years ago, but is no longer considered "legal" by LEGO)

This technique is used in 21309 Saturn V, to mount the flag piece as part of the moon diorama.

Given this set was released in 2017, I’d say its definitely a modern usage.

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    It's a tile and not a plate... tiles wedged between studs aren't considered illegal, however studded plates are problematic as the lego logo embossed on the studs of the bottom plates protrude against the studs of the wedged plate... – Michael Verschaeve Mar 29 at 10:53

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