Final answer:
Supporting details indicating an uneventful journey of the Mary Celeste include the crew's routine activities at Naples, the normal passenger behavior, and the lack of panic or distress in the crew's interactions.
Step-by-step explanation:
The detail from the text that best supports the idea that before the disappearance of the crew, the Mary Celeste's journey was uneventful is the passage: "The next morning we tied up at Naples to take on our cargo, and I went on shore for the day." This suggests that the ship's activities were routine up until that point, with the ship making port stops as planned and crew members going about their regular duties without any indications of distress.
Another supportive detail is found where the situation is described as typical, with passengers going down to dinner and the character engaging in a casual conversation with Mrs. Ebbling on the deck. There were no signs of panic or hurry which implies normality and calmness indicative of an uneventful voyage.
Finally, the lack of urgency or apparent danger in the crew's interactions also points to a journey that was uneventful until whatever unforeseen event led to their disappearance, as evidenced by: "There were no hurried words, no pallor, no plain agitation. The men simply looked at the shore."