[8] On April 27th, 2023 the MSC Seaside scored a 67 out 100 by the Centers for Disease Control and Prevention's Vessel Sanitation Program, citing issues such as poorly cleaned dishware and flies.

[11] Construction officially began on MSC Seaside with the celebration of the first steel-cutting on 22 June 2015 at the Fincantieri shipyard in Monfalcone, Italy.

[12] On 4 March 2016, her keel-laying was performed, in which the first 550-ton block of the ship was laid, marking the beginning of the hull's assembly.

[5] The ceremony was hosted by Mario Lopez and featured performances by Andrea Bocelli and Ricky Martin.

[16] On 17 November 2018, seven crew members were arrested at PortMiami after U.S. Customs and Border Protection officers found 7 kilograms of cocaine and a total of $100,000 in their cabins and in their possession.

[20] The overall architecture of MSC Seaside is based on Fincantieri's Project Mille, a prototype that had not been executed 12 years since its initial conceptualization.

[24][25] MSC Seaside's current design reflects these features, along with a midship engine room and funnels, a wider boardwalk promenade along both sides of the ship, and a wider aft promenade deck that houses a large pool complementing those located on the top decks.