What do you call techniques in the same category as "breaking the fourth wall"? Breaking the fourth wall, is when characters in a fiction refers to things in the real world. What are similar techniques in the same category called? Are they called "meta" techniques? I recall there was a word, but I am not sure if "meta" is the correct word.
I would describe "breaking the fourth wall" as the fictional world showing awareness of the audience (and/or that it itself is a fiction), for example by having a character address the audience.
Other related techniques that come to mind include:
cameo appearances by people that don't particularly make sense in the fictional world, such as the director of the film itself
allusions that may make (often humorous or ironic) sense to the audience from a context that doesn't really make sense in the fictional world
"Meta" is a very general term, but it is sometimes lazily informally used to mean self-reference in a vague way (or to mean other things).
Perhaps you should ask what specific other techniques you have in mind are called?