The original poster features the sixteen main actors disposed as identity photo cards (all them nude making a sensual pose) in a 4x4 square. From left to right and from up to down these are:
-Jorge Suquet, Melina Matthews, Raúl Arévalo and Verónica Echegui.
-Carlos Cuevas, Ana Milán, María León and Aixa Villagrán.
-Miki Esparbé, Anna Castillo, Álvaro Cervantes and Ricardo Gómez.
-María Morales, Luis Callejo, Pilar Castro and Ernesto Alterio.
-Jorge Suquet, Melina Matthews, Raúl Arévalo and Verónica Echegui.
-Carlos Cuevas, Ana Milán, María León and Aixa Villagrán.
-Miki Esparbé, Anna Castillo, Álvaro Cervantes and Ricardo Gómez.
-María Morales, Luis Callejo, Pilar Castro and Ernesto Alterio.
The story involving Marta, Paco, Claudia and Alberto (María Morales, Luis Callejo, Pilar Castro and Ernesto Alterio) is the only one not related with Club Paraíso.
Reunites Miki Esparbé with Álvaro Cervantes after Drug Squad: Costa del Sol (2019). However, they don't share a scene.
The similarly provocative film Shortbus (2006) also ends with a marching band playing in a sex club.