The legislation does not make attribution and integrity issues purely mechanical. It provides reasonableness tests.
For attribution, there is no infringement if the person establishes that it was reasonable in all the circumstances not to identify the author. For literary, dramatic, musical and artistic works, the listed factors include the nature of the work, the purpose, manner and context of use, relevant industry practice, any relevant voluntary code of practice, the difficulty or expense of identifying the author, whether the work was made in employment or under a contract for services, and, for multiple authors, their views about the failure to identify them.
For films, similar factors apply, including the nature of the film, its primary purpose, the purpose, manner and context of use, relevant industry practice, voluntary codes, difficulty or expense of identification, and whether the film was made in the course of employment of the director, producer or screenwriter.
For integrity, there is no infringement if the person establishes that it was reasonable in all the circumstances to subject the work to the treatment. The legislation lists similar factors, and also specifically includes whether the treatment was required by law or otherwise necessary to avoid a breach of law.
The legislation also says that later acts done in relation to a work or film that has already been subjected to certain kinds of derogatory treatment may not infringe if it was reasonable in all the circumstances to do that later act.
For businesses, the practical lesson is that if you rely on reasonableness, you should be able to explain and evidence the decision. A bare statement that there was no room for a credit, or that the campaign required the edit, may not be enough on its own.