A trellis with plants is seen on I Love Lucy LA set. The plants appear to grow over time. Note the dates in the photos above which suggest they are real plants. An original color publicity picture of Lucy and Desi below appears to have been taken in front of the same trellis. The tall plant has red branched and small flowers/leaves with a shape similar to a type of orchid . An orchid expert at PacOrchidExpo on instagram has looked at it a said it is not an orchid.  My search fror a shrub with red branches  on google came up with Red twig Dogwood ( Cornus sericea ‘Cardinal’) or Cornus Siberica
On the left is a Red twig Dogwood shrub and on the right is the original color photo of Lucille and Desi taken on the I Love Lucy LA set. The red branches do look similar. Could the small flowers seen in the photo be from  another plant?

The lower plants appear to include Philodendron,   Anthurium ‘Flamingo Flower’  and a Rubber Plant.

This one is Dogwood Siberica ( Cornus siberica) with small leaf clusters.

My photoshop impression of the plants in color based on the color photo.

Thanks again to johndalessio and PacOrchidExpo on instagram for valuable input.