OK, fair enough re rubbish : I just thought it was there to show the painstaking processes forensic go through and , also, the sad details of kids' stuff like bits of balloons and party candles, so symbols, rather than clues. imo.
I didn't think the tagline was a spoiler. It's on imdb, I believe , or something like that which anyone can look at at any point...it's a hook to get viewers watching, as are trailers. It wasn't called as a spoiler at the time. Oh well. Don't want to have an argument about what a spoiler is, but it's details about plot coming from an actual programme or film which someone has seen in advance of others. This caused problems with that ITV drama that was also available to view in its totality streamed and always causes WW3 on Strictly threads.
People are discussing what they think based on a range of sources on the silly Masked Singer show thread. Again, no one ACTUALLY knows, so they aren't spoilers.