i have been to several funerals here, with rather expensive coffins and never seen them broken or crashed either.
anyways, my experience:
dress code is not as strict as in europe. you can wear black, white or some dark shades of blue, green, brown. men often wear chacabanas, white, black, pale blue. with poorer people anything goes as the participants often do not have a huge variety of clothing.
in a funeral home coffee and water are served. air conditioning in the room with the body is very strong so people come in and out saying their last goodbyes. the coffin is either open or there is a glass window to see the body. the crowd is not loud but there is lots of talking being done. often this is the only opportunity for entire family to come together. it is important to show people care. patting on the back, hugs and holding hands is common.
bodies are usually placed in small mausolea type of structure. richer people have buildings dedicated to their own families. normal folks are just placed in a communal buildings, slotted into individual niches. the entrance is then closed down with cement blocks. the whole process may seem quite sacrilegious, especially in old cemeteries where little space is available. i call it coffin gymnastics because often the coffin is pushed and pulled in vertical position or sideways.
after the funeral there would often be a dinner. if the diseased was old the general atmosphere is quite positive. it's more of a celebration of life of that person than mourning the death. memories are exchanged, stories told.
for 9 days after the death the mass is celebrated. then once a month, then once a year.
in the pharmacy i once saw a barrio funeral: loud bachata blasting from several cars. the coffin was in a back of a jeepeta with folded sits. the caravan stopped for a moment, 6 men carried the coffin from the car and run with it down the street. 5 minutes later they were back, again running. i was told it was customary for the dead to "visit" the house once again, before the funeral. and bachata was his funeral wish. people participating were dressed in regular clothing. the whole thing was surprisingly joyful. i liked it.