When on the ship, Logan and Leslie move to the bulwark and Logan holds on to the pillar to his right. In the very next shot, he has both of his hands on the top rail and then holds on to the pillar to his right again.
In his chambers, Logan repacks Leslie's fancy dress into the suitcase after Slade had partially removed it. In doing so, he leaves a small part still exposed outside the suitcase when he closes the lid. He then places it on a shelf. Later, when Logan is in a meeting with Lord Mere, the suitcase is still on the shelf, but no part of the dress is now visible.
The contention is that Logan confuses Leslie with Lady Mere, but the first time Lord Mere meets Logan, Mere says his wife is American. Leslie is definitely not American.