Answer:
Two of the complications created by Mr. Dussel's presence in the annex are:
1. His insistence on communicating with his wife and other people outside the annex, which puts them all in danger of detection.
2. His strictness and stinginess, which inconvenience Anne and other members of the annex.
Explanation:
Mr. Dussel is a strict disciplinarian and has too many opinions about etiquette, he constantly tells Anne to keep quiet but then disturbs everyone with his morning exercises.
He also got a package from his wife but decided to keep everything to himself, he does not share his sizable stash of personal food with the other residents or their Dutch helpers.
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