Eren had given Julie enough to make her see Dom and his backer as the real culprit.
But just in case, the Osan Woods' Butcher decided to leave more breadcrumbs for his pursuers. Therefore he led those two ladies who were following the fake Dom into an inn.
The fake Dom made the two ladies drink a lot of booze to dull their senses once they all got into their reserved room. Eren had already given a lot of stuff to store in the ID stone Reen was using. The strong booze was included in that storage.
Eren had booked another room to enter the inn. Then entered Dom's room after he opened the door for him. Both the ladies had already gotten delirious by then.
Eren didn't want to kill these two ladies. They would serve as the breadcrumbs/proofs for Dom's supposed involvement in Isaac's murder.
