When Char takes Ella to the hall of mirrors, he holds both of her hands. Later, when the clock reaches 12, Ella has the dagger though there were no places in which she could have kept the dagger without Char seeing.
When Slannen the elf frees Ella from prison, Ella opens Benny to find out where Edgar is. When she opens the book she opens to the first page. In the next shot the book's pages have been opened to the middle.
Ella's enchantment fails on at least two occasions: when Prince Charmont says "Allow me" and she continues to refuse his help, and when Slannen says "Forget it" and she continues to discuss his legal aspirations. The earlier "bite me" scene established that Ella's enchantment takes colloquial "commands" literally, thus she should have allowed Char to help her, and literally forgotten about Slannen's peeves.