missing FROM-clause notice but nothing is missing ...

I get a "missing FROM-clause" with the following query. I don't see why
as prod_id is a FK in the supposedly missing table ...

I also get an error on my ORDER by, even though I am ordering on
products.id which is what both selects retrieve ...

This looks like a simple thing but I cannot figure out what I missed ....

DB=# SELECT products.id
FROM products
WHERE name ILIKE 'AA'

UNION

SELECT prod_id
FROM rel_cast_crew_movies
WHERE cast_crew_id=1012
ORDER BY products.id;

NOTICE: Adding missing FROM-clause entry for table "products"
ERROR: ORDER BY on a UNION/INTERSECT/EXCEPT result must be on one of
the result columns

I even tried this convoluted query to get around the notice and error
but to no avail:

DB=# SELECT products.id
FROM products
WHERE name ILIKE 'AA'

UNION

SELECT products.id
FROM rel_cast_crew_movies, products
WHERE cast_crew_id=1012
AND prod_id=products.id
ORDER BY products.id;

The tables:

DB=# \d rel_cast_crew_movies
Table "public.rel_cast_crew_movies"
Column | Type | Modifiers
--------------+---------+-----------
prod_id | integer | not null
cast_crew_id | integer | not null
Indexes: rel_cast_crew_movies_pkey primary key btree (cast_crew_id, prod_id)
Foreign Key constraints: $1 FOREIGN KEY (prod_id) REFERENCES
products(id) ON UPDATE NO ACTION ON DELETE CASCADE DEFERRABLE INITIALLY
DEFERRED,
$2 FOREIGN KEY (cast_crew_id) REFERENCES
cast_crew(id) ON UPDATE NO ACTION ON DELETE CASCADE DEFERRABLE INITIALLY
DEFERRED